若xy=负根号2,x-y=5根号2 -1,则(x+1)(y-1)=
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若xy=负根号2,x-y=5根号2 -1,则(x+1)(y-1)=
若xy=负根号2,x-y=5根号2 -1,则(x+1)(y-1)=
若xy=负根号2,x-y=5根号2 -1,则(x+1)(y-1)=
很简单啊
(x+1)(y-1)=xy-(x-y)-1
=-根号2-5根号2-1
=-6根号2